In brief, we are inclined to go along with someone’s suggestion if we think that person is a credible expert (authority), if we regard him or her as a trusted friend (liking), if we feel we owe them one (reciprocity), or if doing so will be consistent with our beliefs or prior commitments (consistency). We are also inclined to make choices that we think are popular (consensus [social proof]), and that will net us a scarce commodity (scarcity).
When people buy a product they are showing their trust in it. In return, your product needs to be worthy of the money they spent. Consider how your brand can stand out among others and what you can offer to leverage against competitors. Once a buyer makes an emotional-connect with the brand, he is more inclined towards making a purchase with confidence.
The execution of sales funnel stages depend on your efforts and resources. By improving brand visibility and making information related to your product/service readily available, you can build a strong database of customers and prospects. This can help you set and achieve future goals. More importantly, it is also essential to focus beyond the purchase stage, as it is relatively cheaper to retain an existing customer than acquire a new one.